"The Cruel Sea" is a 1953 British war film directed by Charles Frend, based on the novel by Nicholas Monsarrat. The story follows the crew of a Royal Navy corvette during World War II as they patrol the Atlantic Ocean, facing the dangers of German U-boats. The film highlights the challenges and camaraderie among the sailors as they confront the harsh realities of naval warfare. The film features a strong cast, including Jack Hawkins and Donald Sinden, and is noted for its realistic portrayal of life at sea. It emphasizes themes of bravery, sacrifice, and the emotional toll of war, making it a significant entry in the genre of war films.